I need to heat air from 20oC to 80oC. I have two circular ducts each 10 cm in diameter and 2 m long. One is at a constant temperature of 100oC, and the other supplies a constant surface heat flux and dissipates 20 kW. I want to heat the largest flow rate of air possible (at 1 atm). Assume fully developed flow. a.)In whi ch order should I arrange the ducts (constant temperature or constant heat flux first)?b.)What is the maximum flowrate that I can supply using this arrangement? c.)What is the maximum temperature of the constant heat flux duct wall in this arrangement?